Jack's girlfriend wants him to be the father of her child but not get married which Jack believes in. He then leaves. Later she calls him to talk about it and when Janet hears it, she assumes that his girlfriend is already pregnant. So she tells Jack to go there and do the right thing, which he assumes is Janet telling him it's OK to father her child.
Larry visits Jack as he is cleaning the apartment and finds a magazine quiz about sleeping with a roommate. Larry & Jack assume Janet or Terri must have filled it out. Larry suggests they all go to a mountain cabin to figure it which gal.
Jack goes to the ATM to withdraw $100. The ATM malfunctions and gives him a $1,000. Jack leaves a message for the bank to return the money on Monday. He hides the money in the couch at home, not realizing Mr Furley is taking the couch.
Janet's father is visiting. Jack tells his roommate about his new girlfriend Doreen, but is hesitant to tell what she does for a living. She is a sex therapist, but when Janet meets her, she thinks Doreen is a prostitute.
Terry thinks the only way she will get a promotion is if she has an affair with him, so Terry pretends to be married. When Dr Kenderson & his wife show up at the apartment for dinner, Jack pretends to be the husband.
Janet starts working as an aerobics instructor. Jack, Terry, & Mr Furley attend her class to show their support. Jack shows an interest in her female boss, but it turns on him when Tina expects Jack to be her constant companion.
A former girlfriend of Jack's calls and asks to meet in the park to discuss how to save her marriage to her jealous husband. When Mr Furley comes to the park, they hid from Furley accidentally in the poison ivy. How to explain that?
When they find a cat on their door step they take it in but unfortunately pets are not allowed in the building so they hide it. But when Furley sees it he takes a liking to it and takes it in. But when an inspector his brother sent to see if all the rules of the building are enforced he hides it. At the same time the cat's owner a little girl comes looking for it and when jack asks for it Furley tells him that he took the cat to the pound. So they each get a cat for the girl. When the inspector arrives they try to hide the cats.
A pretty art teacher moves in next to the three, and Jack takes her classes in order to get close to her. He agrees to be a model but finds out he has to be nude. Embarrassing enough, but then Mr Furley joins the class.
Jack uses Janet's new car without permission and has an accident. He totals the car. When he in in the hospital, Terri overhears the wrong diagnosis and assumes Jack has amnesia. Jack plays along so he does not get yelled at by Janet.
Janet's boyfriend proposes, and she announces she is moving out. Jack is on an airplane and nervous. He meets Vicky, a stewardess, and everything goes wrong. He asks her to dinner for a second chance, but her father interferes.
Janet & Phillip plan for wedding at Janet's apartment. Jack wants to win the approval of Vicki's father. Mr Bradford tells Jack that Vicki is up for a promotion at work, in another state, and turned it down. Jack tells her to take it.
Janet is married and starts her new life. Terry announces she is moving to Hawaii. Vicki and Jack get back together but she does not want to get married. Since her parents divorced, she does not believe in marriage, but she will live with him.